/**
*      author: Y_Yao
*      created: 2025-02-21 11:43:06
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 1e18;
const int INF = 0x3f3f3f3f;
int n;

void solve()
{
    cin >> n;
    vector<int> all;
    for(int i = 1;i < 1024;i++)
    {
        int val = 0;
        for(int j = 0;j < 10;j++)
        {
            if((i >> j) & 1)
            {
                val  = val * 10 + (9 - j);
            }
        }
        all .push_back(val);
    }

    sort(all.begin(),all.end());
    cout << all[n] << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    //cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}